223 or 556

About 6 years agoI bought a ameetek arms ar15.I took it out of the closet today and a friend and I are going to the range this weekend.I looked all over this gun and it does not say what caliber it is.The lower is marked multi.My friend has both 223 or 556 ammo.Any help much appreciated.

About 6 years agoI bought a ameetek arms ar15.I took it out of the closet today and a friend and I are going to the range this weekend.I looked all over this gun and it does not say what caliber it is.The lower is marked multi.My friend has both 223 or 556 ammo.Any help much appreciated.

1:9 would handle both well. 1:7 is more suited towards 5.56 but it will still fire. 223 might not have as good results but if you are aiming minute of man you will do just fine. Have fun.

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No bellson, not true..

Originally Posted by bellson

The two are essentially interchangeable but accuracy may suffer.

Shoot all you want!

I thought the same. Read this..

".223 Remington vs. 5.56 NATO: What You Donít Know Could Hurt You"
Is firing a 5.56 NATO cartridge in your .223 Remington chambered AR15 dangerous? Or do Internet forum-ninjas and ammunition companies selling you commercial ammo instead of surplus overstate the dangers? Believe it or not, a real danger exists, and some gun owners who think they are doing the right thing may not be safe.

The 5.56 case has thicker walls to handle higher pressures, meaning the interior volume of the case is smaller than that of a .223. This will alter the loading data used when reloading 5.56 brass to .223 specs.